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Kees Cook e52432e164 tpm: vtpm_proxy: Check length to avoid compiler warning
When building with -Warray-bounds under GCC 11.2, this warning was
emitted:

In function 'memset',
    inlined from 'vtpm_proxy_fops_read' at drivers/char/tpm/tpm_vtpm_proxy.c:102:2:
./include/linux/fortify-string.h:43:33: warning: '__builtin_memset' pointer overflow between offset 164 and size [2147483648, 4294967295]
[-Warray-bounds]
   43 | #define __underlying_memset     __builtin_memset
      |                                 ^

This warning appears to be triggered due to the "count < len"
check in vtpm_proxy_fops_read() splitting the CFG[1], and the compiler
attempting to reason about the possible value range in len compared
to the buffer size.

In order to silence this warning, and to keep this code robust if the
use of proxy_dev->req_len ever changes in the future, explicitly check
the size of len before reaching the memset().

[1] https://lore.kernel.org/lkml/CAG48ez1iTF9KegKJrW5a3WzXgCPZJ73nS2_e5esKJRppdzvv8g@mail.gmail.com

Cc: Peter Huewe <peterhuewe@gmx.de>
Cc: Jarkko Sakkinen <jarkko@kernel.org>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: linux-integrity@vger.kernel.org
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Link: https://lore.kernel.org/lkml/4b59d305-6858-1514-751a-37853ad777be@linux.ibm.com
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220119184354.3367603-1-keescook@chromium.org
2022-02-27 10:58:04 -08:00
arch alpha: Silence -Warray-bounds warnings 2022-02-13 16:48:04 -08:00
block block: bio-integrity: Advance seed correctly for larger interval sizes 2022-02-03 21:09:24 -07:00
certs certs: Fix build error when CONFIG_MODULE_SIG_KEY is empty 2022-01-23 00:08:44 +09:00
crypto lib/crypto: blake2s: avoid indirect calls to compression function for Clang CFI 2022-02-04 19:22:32 +01:00
Documentation xen: branch for v5.17-rc3 2022-02-05 10:40:17 -08:00
drivers tpm: vtpm_proxy: Check length to avoid compiler warning 2022-02-27 10:58:04 -08:00
fs Various bug fixes for ext4 fast commit and inline data handling. Also 2022-02-06 10:34:45 -08:00
include Various bug fixes for ext4 fast commit and inline data handling. Also 2022-02-06 10:34:45 -08:00
init lib/stackdepot: allow optional init and stack_table allocation by kvmalloc() 2022-01-22 08:33:37 +02:00
ipc ipc/sem: do not sleep with a spin lock held 2022-02-04 09:25:05 -08:00
kernel perf/urgent contains 3 fixups: 2022-02-06 10:11:14 -08:00
lib lib/crypto: blake2s: avoid indirect calls to compression function for Clang CFI 2022-02-04 19:22:32 +01:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm mm/kmemleak: avoid scanning potential huge holes 2022-02-04 09:25:05 -08:00
net A patch to make it possible to disable zero copy path in the messenger 2022-02-04 09:54:02 -08:00
samples Merge branch 'akpm' (patches from Andrew) 2022-01-20 10:41:01 +02:00
scripts ftrace: Have architectures opt-in for mcount build time sorting 2022-01-27 19:15:44 -05:00
security selinux/stable-5.17 PR 20220203 2022-02-03 16:44:12 -08:00
sound ASoC: Fixes for v5.17 2022-02-01 16:52:54 +01:00
tools perf tools fixes for v5.17: 1st batch 2022-02-06 10:18:23 -08:00
usr kbuild: remove include/linux/cyclades.h from header file check 2022-01-27 08:51:08 +01:00
virt Two larger x86 series: 2022-01-28 19:00:26 +02:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: update Christian Brauner's email address 2022-02-01 11:21:31 -08:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Removing Ohad from remoteproc/rpmsg maintenance 2021-12-08 10:09:40 -07:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS ata fixes for 5.17-rc3 2022-02-04 11:52:37 -08:00
Makefile Linux 5.17-rc3 2022-02-06 12:20:50 -08:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.